A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 961, SAN FERNANDO, CA 91341-0961
PO BOX 962, SAN FERNANDO, CA 91341-0962
PO BOX 963, SAN FERNANDO, CA 91341-0963
PO BOX 964, SAN FERNANDO, CA 91341-0964
PO BOX 965, SAN FERNANDO, CA 91341-0965
PO BOX 966, SAN FERNANDO, CA 91341-0966
PO BOX 967, SAN FERNANDO, CA 91341-0967
PO BOX 968, SAN FERNANDO, CA 91341-0968
PO BOX 969, SAN FERNANDO, CA 91341-0969
PO BOX 970, SAN FERNANDO, CA 91341-0970
PO BOX 971, SAN FERNANDO, CA 91341-0971
PO BOX 972, SAN FERNANDO, CA 91341-0972
PO BOX 973, SAN FERNANDO, CA 91341-0973
PO BOX 974, SAN FERNANDO, CA 91341-0974
PO BOX 975, SAN FERNANDO, CA 91341-0975
PO BOX 976, SAN FERNANDO, CA 91341-0976
PO BOX 977, SAN FERNANDO, CA 91341-0977
PO BOX 978, SAN FERNANDO, CA 91341-0978
PO BOX 979, SAN FERNANDO, CA 91341-0979
PO BOX 980, SAN FERNANDO, CA 91341-0980
PO BOX 981, SAN FERNANDO, CA 91341-0981
PO BOX 982, SAN FERNANDO, CA 91341-0982
PO BOX 983, SAN FERNANDO, CA 91341-0983
PO BOX 984, SAN FERNANDO, CA 91341-0984
PO BOX 985, SAN FERNANDO, CA 91341-0985
PO BOX 986, SAN FERNANDO, CA 91341-0986
PO BOX 987, SAN FERNANDO, CA 91341-0987
PO BOX 988, SAN FERNANDO, CA 91341-0988
PO BOX 989, SAN FERNANDO, CA 91341-0989
PO BOX 990, SAN FERNANDO, CA 91341-0990
PO BOX 991, SAN FERNANDO, CA 91341-0991
PO BOX 992, SAN FERNANDO, CA 91341-0992
PO BOX 993, SAN FERNANDO, CA 91341-0993
PO BOX 994, SAN FERNANDO, CA 91341-0994
PO BOX 995, SAN FERNANDO, CA 91341-0995
PO BOX 996, SAN FERNANDO, CA 91341-0996
PO BOX 997, SAN FERNANDO, CA 91341-0997
PO BOX 998, SAN FERNANDO, CA 91341-0998
PO BOX 999, SAN FERNANDO, CA 91341-0999
PO BOX 1000, SAN FERNANDO, CA 91341-1000
PO BOX 1001, SAN FERNANDO, CA 91341-1001
PO BOX 1002, SAN FERNANDO, CA 91341-1002
PO BOX 1003, SAN FERNANDO, CA 91341-1003
PO BOX 1004, SAN FERNANDO, CA 91341-1004
PO BOX 1005, SAN FERNANDO, CA 91341-1005
PO BOX 1006, SAN FERNANDO, CA 91341-1006
PO BOX 1007, SAN FERNANDO, CA 91341-1007
PO BOX 1008, SAN FERNANDO, CA 91341-1008
PO BOX 1009, SAN FERNANDO, CA 91341-1009
PO BOX 1010, SAN FERNANDO, CA 91341-1010
PO BOX 1011, SAN FERNANDO, CA 91341-1011
PO BOX 1012, SAN FERNANDO, CA 91341-1012
PO BOX 1013, SAN FERNANDO, CA 91341-1013
PO BOX 1014, SAN FERNANDO, CA 91341-1014
PO BOX 1015, SAN FERNANDO, CA 91341-1015
PO BOX 1016, SAN FERNANDO, CA 91341-1016
PO BOX 1017, SAN FERNANDO, CA 91341-1017
PO BOX 1018, SAN FERNANDO, CA 91341-1018
PO BOX 1019, SAN FERNANDO, CA 91341-1019
PO BOX 1020, SAN FERNANDO, CA 91341-1020
PO BOX 1021, SAN FERNANDO, CA 91341-1021
PO BOX 1022, SAN FERNANDO, CA 91341-1022
PO BOX 1023, SAN FERNANDO, CA 91341-1023
PO BOX 1024, SAN FERNANDO, CA 91341-1024
PO BOX 1025, SAN FERNANDO, CA 91341-1025
PO BOX 1026, SAN FERNANDO, CA 91341-1026
PO BOX 1027, SAN FERNANDO, CA 91341-1027
PO BOX 1028, SAN FERNANDO, CA 91341-1028
PO BOX 1029, SAN FERNANDO, CA 91341-1029
PO BOX 1030, SAN FERNANDO, CA 91341-1030
PO BOX 1031, SAN FERNANDO, CA 91341-1031
PO BOX 1032, SAN FERNANDO, CA 91341-1032
PO BOX 1033, SAN FERNANDO, CA 91341-1033
PO BOX 1034, SAN FERNANDO, CA 91341-1034
PO BOX 1035, SAN FERNANDO, CA 91341-1035
PO BOX 1036, SAN FERNANDO, CA 91341-1036
PO BOX 1037, SAN FERNANDO, CA 91341-1037
PO BOX 1038, SAN FERNANDO, CA 91341-1038
PO BOX 1039, SAN FERNANDO, CA 91341-1039
PO BOX 1040, SAN FERNANDO, CA 91341-1040
PO BOX 1041, SAN FERNANDO, CA 91341-1041
PO BOX 1042, SAN FERNANDO, CA 91341-1042
PO BOX 1043, SAN FERNANDO, CA 91341-1043
PO BOX 1044, SAN FERNANDO, CA 91341-1044
PO BOX 1045, SAN FERNANDO, CA 91341-1045
PO BOX 1046, SAN FERNANDO, CA 91341-1046
PO BOX 1047, SAN FERNANDO, CA 91341-1047
PO BOX 1048, SAN FERNANDO, CA 91341-1048
PO BOX 1049, SAN FERNANDO, CA 91341-1049
PO BOX 1050, SAN FERNANDO, CA 91341-1050
PO BOX 1051, SAN FERNANDO, CA 91341-1051
PO BOX 1052, SAN FERNANDO, CA 91341-1052
PO BOX 1053, SAN FERNANDO, CA 91341-1053
PO BOX 1054, SAN FERNANDO, CA 91341-1054
PO BOX 1055, SAN FERNANDO, CA 91341-1055
PO BOX 1056, SAN FERNANDO, CA 91341-1056
PO BOX 1057, SAN FERNANDO, CA 91341-1057
PO BOX 1058, SAN FERNANDO, CA 91341-1058
PO BOX 1059, SAN FERNANDO, CA 91341-1059
PO BOX 1060, SAN FERNANDO, CA 91341-1060
PO BOX 1061, SAN FERNANDO, CA 91341-1061
PO BOX 1062, SAN FERNANDO, CA 91341-1062
PO BOX 1063, SAN FERNANDO, CA 91341-1063
PO BOX 1064, SAN FERNANDO, CA 91341-1064
PO BOX 1065, SAN FERNANDO, CA 91341-1065
PO BOX 1066, SAN FERNANDO, CA 91341-1066
PO BOX 1067, SAN FERNANDO, CA 91341-1067
PO BOX 1068, SAN FERNANDO, CA 91341-1068
PO BOX 1069, SAN FERNANDO, CA 91341-1069
PO BOX 1070, SAN FERNANDO, CA 91341-1070
PO BOX 1071, SAN FERNANDO, CA 91341-1071
PO BOX 1072, SAN FERNANDO, CA 91341-1072
PO BOX 1073, SAN FERNANDO, CA 91341-1073
PO BOX 1074, SAN FERNANDO, CA 91341-1074
PO BOX 1075, SAN FERNANDO, CA 91341-1075
PO BOX 1076, SAN FERNANDO, CA 91341-1076
PO BOX 1077, SAN FERNANDO, CA 91341-1077
PO BOX 1078, SAN FERNANDO, CA 91341-1078
PO BOX 1079, SAN FERNANDO, CA 91341-1079
PO BOX 1080, SAN FERNANDO, CA 91341-1080
PO BOX 1081, SAN FERNANDO, CA 91341-1081
PO BOX 1082, SAN FERNANDO, CA 91341-1082
PO BOX 1083, SAN FERNANDO, CA 91341-1083
PO BOX 1084, SAN FERNANDO, CA 91341-1084
PO BOX 1085, SAN FERNANDO, CA 91341-1085
PO BOX 1086, SAN FERNANDO, CA 91341-1086
PO BOX 1087, SAN FERNANDO, CA 91341-1087
PO BOX 1088, SAN FERNANDO, CA 91341-1088
PO BOX 1089, SAN FERNANDO, CA 91341-1089
PO BOX 1090, SAN FERNANDO, CA 91341-1090
PO BOX 1091, SAN FERNANDO, CA 91341-1091
PO BOX 1092, SAN FERNANDO, CA 91341-1092
PO BOX 1093, SAN FERNANDO, CA 91341-1093
PO BOX 1094, SAN FERNANDO, CA 91341-1094
PO BOX 1095, SAN FERNANDO, CA 91341-1095
PO BOX 1096, SAN FERNANDO, CA 91341-1096
PO BOX 1097, SAN FERNANDO, CA 91341-1097
PO BOX 1098, SAN FERNANDO, CA 91341-1098
PO BOX 1099, SAN FERNANDO, CA 91341-1099
PO BOX 1100, SAN FERNANDO, CA 91341-1100
PO BOX 1101, SAN FERNANDO, CA 91341-1101
PO BOX 1102, SAN FERNANDO, CA 91341-1102
PO BOX 1103, SAN FERNANDO, CA 91341-1103
PO BOX 1104, SAN FERNANDO, CA 91341-1104
PO BOX 1105, SAN FERNANDO, CA 91341-1105
PO BOX 1106, SAN FERNANDO, CA 91341-1106
PO BOX 1107, SAN FERNANDO, CA 91341-1107
PO BOX 1108, SAN FERNANDO, CA 91341-1108
PO BOX 1109, SAN FERNANDO, CA 91341-1109
PO BOX 1110, SAN FERNANDO, CA 91341-1110
PO BOX 1111, SAN FERNANDO, CA 91341-1111
PO BOX 1112, SAN FERNANDO, CA 91341-1112
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